# NEET Physics Nuclei Questions Solved

The decay constant of a radio isotope is $\mathrm{\lambda }.$ If ${\mathrm{A}}_{1}$ and ${\mathrm{A}}_{2}$ are its activities at times ${\mathrm{t}}_{1}$ and ${\mathrm{t}}_{2}$ respectively, the number of nuclei which have decayed during the time $\left({\mathrm{t}}_{1}-{\mathrm{t}}_{2}\right)$

(a) ${\mathrm{A}}_{1}{\mathrm{t}}_{1}-{\mathrm{A}}_{2}{\mathrm{t}}_{2}$                                       (b) ${\mathrm{A}}_{1}-{\mathrm{A}}_{2}$

(c) $\frac{\left({\mathrm{A}}_{1}-{\mathrm{A}}_{2}\right)}{\mathrm{\lambda }}$                                         (d) $\mathrm{\lambda }\left({\mathrm{A}}_{1}-{\mathrm{A}}_{2}\right)$

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